Carbureter.



Ffv'zedqe d'.

G. SCH MIDT.

CARBURETER. Arruqnnox H Lsn 12112.15, 190e.

PATENTED MAR. 17, 1908.

Y ,Elven/fof We/MQ@ @MM construction and `eombiinttions of interi-terr otre-gijon CARBURETER.

Application filed February l5, 1906.

To all whom it may con cern:

Be it known that I, CHARLES Scnuio'r, a citizen ot the Republic, of France, residing at Cleveland, in the countyl of Cuyahoga and State of Ohio, have invented a certain new :rnd useful Improvement in (farlnireters, ot whioh the following is a full, clear, and exact deseripton, reference being, had to the aoeompenying drawings.

T his invention relates to a earbureter vfor an explosive engine, especially adapted for use on automobiles where it .is ret uired that the engine shall be run at varia-ble speed.

The primarv object of the improvement is to adapt a carburetor to automatically Supply at any time the required volume. of a 'smtable explosive mixture to permit the engine to be driven. at an)Y required speed.

The invention resides particularly in. the throttle valve and its associated meelntnism: but it 'includes additionally certain novel means for increasing` and regulating the supply of air as required 'for making' an increased quantity of the explosive mixture.

The invention ma)i be summarized as the parts Shown in the drawing and hereinafter described and claimed.

In the drawing, Figure l represents the improved carburetor and some associated parts,-the throttle valve ohamlmr, the mixing tube and a. part of' the float valve chamber being shown in central section.

' lReferring to the parts by letters, A represents the su )ply tank, and P a limit-valve chamber both of ordinary oolistruetion.

@represents the spray )lug through which the hyt'lro-earbon in Said float-valvey chamber is delivered es a s ray into the vertical mixing tube l). The lfnver end of this tuhe is open, but ot' contracted` area for the admission of air which assists in volatilization of the hydro-carbon spray and mixes with the vapor so lformed to form the explosive mixture. There are holes d in the side of the mixing tube near its lower end. A valve sleeve F embraees said lower end and has holes fin it. By .turning said sleeve, the holes (l may be entirely covered or opened more or less to admit a greater or less quantity of air to the mixingl tube. Onthe sleeve F is an-arm f to which may be attaehed on operatinijr rod I. This rod is to be extended to any convenient pointtor its operation.

Specification of Letters Patent.

Patented Marc-ii t7', 1908 Serial No. 301,169.

The. mixing' tube is attached at its upper end to the throttle valve casing: E which lifts an outlet t. (ver this outlet is connected. the branched pipe li whirh leads to the explosion elnun-bers of the engine cylinders. ln this valve casing, between the point, where the explosive mixture enters troni the mixing;` Lube. and the diselnuge outletl t, is an approximately balanced throttle valve (Qr, lntving two tapered surfaces g and g 'whirh are opposed tothe two tapered valve seats a and r, located on opposite sides ot the outlet n. This 'valve is connected with two stems ll, ll which pass respectively through holes in opposite ends of the valve easing, one stem ll being' for connection withthe manuallv operated throttle controllingr meehanism, the other lt" for com neetion with an automatie governor. Pret erabijv a roiled sprintf ll" embraces thc stem ll and thrusts against the valve easing' and an adjustable nut /f upon said stent, wherebiF this sprintr :iets to move the throttle valve in the rinsing' direction.

The throttle vnlve is tubular with openings at both ends thereof so as to furnish free eommunieation between the two parts of the valve. casingl at opposite ends of the valve. lh'eferabtv the end of the-vali"y adjacent to the mixingr tube is apiu'oximatetv conicalnml provided with a pluralit of slots y? through which the gas ma)r llow into the valve and thenee into that part of the valve easing at' the opposite end 'of the valve. i

- ln carbureteis of the general type shown, it is the suction of the pistons which draws the e'asolene through the spra v plug and which draws air into the mixing;p tube and which draws the mixture produced into the explosion chambers. ln such earbureters, as have been heretofore constructed, the flow of the gas mixture. toward the explosion chambers tends either to open or close. the throttle valve according as it is arranged. rlo eounteraet this tendency, springs have been employed, but they have not proved entirely satisfaetor)Y in practice for the reason that as the speed of the engines increase the suction increases. If' said springs are set to eounteraet the force of the ttowing gas, tending to open or close the throttle under cert ain conditions, the said spring will be too powerful or too week to produce the desired'. result under other eonditions--that is to stty, when the engine is running either `faster or I 'slotgveri `With the construction herein shuown,

however,l the valv''is substantially balanced, and the' flowing gas hasl substantially no inclose it Whatever may be the speed of the en- ',gine. .Thespring-HZ, therefore, when properlyset,has precisely. the same influence upon .the throttle valve under one condition as under another.- vWhen the valve has-been opened, the gas flows past the valve seat e .to the'outlet e2 audit also flows through lthe v alve G past the seat e to the same outlet. A

l l f glven movement of. the'l valve, therefore, permits the flow of substantially double the .quantity-of the-mixture which the same movement would permit if `there were but onevalve seat and, therefore, only-one path throughlwhichsaid gas might travel. The

i f l", variation'sin the speedfof the engine may, l

` rnent'ofsaid valve. fAnothe'radvantage of therefore,'be 'efectedby the smal er movethe described construction is thatlthe mixture passing through the slots g-2 and thence I ,through the valve and past valve seats e .25

becomes more thoroughly miXed-that is to say, the-.hydro-carbon vapor-and 'air become more; thoroughly mixed together than they Would-be except for this construction.

Mostusers of automobiles wish -to have the engines continue to .run when the vehicle is temporarily standing still. Ordinarily this 'result is, produced by the failure of the operator'zto 'complete the vclosing-of the throttle "valvei vsar fiorhim to ldetermine the 'position in which he shall leavehis throttle -controlling i mechanism to bring about the desired result.

" With 4the construction shown, however, the

. ltion the Way to stop the engines will b e to vco i et

turn off the spark. This result may be secured in a practical way by means of -an adjustable sleeve c3 which screws into the valve casing' andzcarries the valve seat e.

construction of automobiles is still in a more orless experimental condition, and it is not pretended that by practical use it has been determined beyond a doubt that the best construction is that in which one cannot entirely close the throttle. The construction shown in the drawing, however, with lthe adjustable sleeve e3 is one which is adapted, as above stated, to be so adjusted that the throttle can be completely closed, or that it may be left open to any extent Which experience shall show to be desirable.

The rapid volatilization of the hydro-'carbon or other fuel used rapidly absorbs heat,

In ordinary constructions it is necesl The and thereby greatiydiniinishes 'the temperature of the gasa'nd of the partso'f the mechanism through J'Which itj flows. The freezing. of the throttle valve,4 to the valve' seat is notan uncommon occurrence as the result of the action referred To counteract this tendency the valve casing'lE is provided with a water jafuzketv J, 'whic l means of pipes y' and j in-fthe water circulating system. 1

When .theenginesare runnin-g very fast thel suction may be sogre'at that v,the amount ofv air which may be supplied through the mixing tubejis inadequate for the fuel which is drawn through the spray plug. 'Y To meet this emergen'cymeans are provided for admitting air to the mixing tube at Va point above that'at which the hydro-carbon spray enters said tube; and the opening through which air is adn'iitted is .controlled by anlautoniatic valve. In the""construction shown, there is a .lateral branch D of' theiniXing tube connected to it near its upper end, which-.branch serves as a valve casing. In the bottom of this casing is'an opening ld3 through which air may be admitted; and this opening is normally ciosedby a valvev M is connected by which is pressed against it`s seat byy a spring m. This'valve is secured to a stemwhich passes both up and down-"through,adjustable plugs d4, d5 in thevalve casing. f The spring m is compressed between the inner. end of the upper vping and the topjofthe valve. By screwing t 's plug inl or out the tension of the spring may be regulated- 011' the pro-f jecting lower-'end of the stem' a collar,` m2 is fixed; and above this collar, around the-stem, is. a small coiled buffer spring. When the valve opens,;its .opening movement-is gradually checked, andulti-mately sto ped by-vsaid` s ring, which iscompressed etween'the p ug and collar. .By screwing this lower plug in or yout the extent of movement of valve M is controlled. The adjustment` of lug d4- determines the degree of rarefaction 1n the said valve casin required to cause the valve to open; amitie adjustment of the plug df'determines'how far said valve ,may open.

H' Tung described my invdntion, I claim:

rio

l. Infa carbureter, thcombination of a l valve casing having v an outlet, twoy valve` seats which are located within the casing and on opposite lsides respectively of said outlet, a sleeve which is adjustably secured Within the casing and upon which one of'said'valve seats is formed, a valve provided with two faces which are respectively adapted for 'cooperation wi th the two valve seats within ,the

, casing, and means for operating said valve'fe i there being fuel passages for the admission of the gas into the casing at both ends of said valve. i

2. in a carbureter, the combinationof a valve casing .having an inlet andv an outlet ond two valve seats on opposite sides ol said. outlet,-one ol them being between said inlet nd outlet, with :t valve lun/ingr surfaces opkloosing said valve seats, and vhaving n fuel n a carljnireter, the ifoii'iliination of a l casing to the other end thereof, and means for operating said valve. I

5. ln a earlnuetelgitlie, Combination ot a valve eii'sin'g liavingan inlet and an outlet and two valveseats on opposite sides of sind outlet, one ol- .them heingbetween said inletl and outlet, with a valve liiifving surfaces casing to -the opposite end thereol', and meansi for moving said valve.

4. In a earburetir, the eoiiilniiation ol' a Valve casing having an inlet at one end and on outlet near the middle, and -two Yalve seats located on opposite sides ol the outlet opening, one ot them being hetween the outlet yand inlet, a sleeve adjustahly secured opposing 'said valve seats,suid valve being tubular and having through one end a phira'iity ol slots which communicate with the interior oll said Valve.

i3. ln a earlnireter, the eon'ibination of a valve easing having an inlet and an outlet and in o valve seats on opposite sides oll said oiitli-t,-oiie of them being between said inlet and outlet, ith a valve liafving surfaces opposing said valve seats, and having a` hole through it from one end to the other, two

n stems secured to oppositie ends of said valve,

and extending out through opposite ends of Asaid easing, and a spring engaging w1th one ol said stems and acting thereon to move the Talve.

Within the easing upon whieh one olisaid Valve seats is formed, a vulve having tu o Valve faces adapted to resneetirely ei i peiiite with the said vulve seats on the easing, said `vnlve having a longitudinal hole extending through it-froin end to end tiii'ougli Vwhieh gas may freelyilow troni the inlet end ol' the ln testimony whereof, I hereunto alliX iny signature in the presence ol two witnesses. 

